It's impossible to do. Selling guns is profitable, so they are going to be made, whatever happens. It's the same thing with drugs, selling them is profitable, so they are going to be made. You cannot stop people from doing that.
It's possible if you reduce production only to military/police force.
And when a criminal wants a gun, he just has to kill a cop.
Which is harder (and obviously would not be as frequent) as buying one in a store or in some back alley. Another stupid rare occurrence example masquerading as an argument from the resident forum propaganda consumer and spreader.
And the back-alley deals wouldn't happen?
By making guns something only police and criminals have, you will have made guns into what you fear they are: nearly every time one is used (including home-built zipguns), it is to end someone's life... usually because they had a gun.
Is that really the world you want to live in?
Correct. But killing a trained person who has a gun with just a knife would require special circumstances. And it still controls inflow of weapons to criminals.
https://en.wikipedia.org/wiki/Improvised_firearmMake a gun to get a gun.
You gonna outlaw pipe fixtures, too?